42 

 Ijcptaena^ King. Stropliomenidw. 184C 



Ann. Mas- Nat. Hist, xyiii, pp. 28, 36. Ist sp. L. rugosa, Dalm. (== rhom- 

 hnidalis). Ibid. Perm.Foss. 1850, p. 81, 104, same type, and adds L. analoga, 

 Pliillips, as also typical, = iep<aena, Dalman,pars, not Dav. = (SfropAo- 

 niena, Davidson pars. (^= Plectambonites, Pander.) 



liepfaema, Davidson. Stropliomenidce. 18.^3. 



Intr. p. 108. Type L. transversalis, Dalm. pi. viii, f. 176-180. Ibid. 

 1856, p. 205, same type, pi. sii, f. 1-5. Syn. FleciambonUea, King; not 

 Leptaena,Kiug. 



IdCptaeiaacea, F. Braun. Arthropomata. 184®. 



Bayr. Petref. p. 45. Fam. Brach. cont. Leptaena. 



IieptaieDaaI®§la, King. Productidce. 1845. 



Murch. Verneuil & Keys. Geol. Eus. Ural, ii, p. 281. (King, dim.) 

 (=^Strophalosia, King.) 



Ijeptsig&MlSLj M'Coy. Strophomenidw. 1 844. 



Carb. Foss. Ireland, p. 116, f. 11-13. First sp., also mentioned in diag- 

 nosis, Producta analoga, Phillips, Geol. Yorkshire, 1836, p. 215, pi. vii, f. 10. 

 M'Coy, 1. c. p. 117, f . 13. (=^ Plectambonites, Pand.) 



Lept®lB0laas5 Hall. Obolidw. ISTl. 



24th Regent's Rep. p. 226, pi. vii, f. 19-20. Oct. (Hudson E. group). 

 Type L. lepis, Hall, 1. c. Ibid. Hall & Whitfield, Ohio Pal. ii, p. 69, 1875. 

 (See Aulonotreta, Kutorga.) 



I^eptofotiltis, Hall. Oholidce. 1871. 



24th Regent's Rep. p. 226, passim, lapsus, = iep'^^'^^^'^- Ihid. U. P. 

 James, Cat. Foss. Cinciu. 1875. 



I^eptocoella, Hall. Atrypidw. 1857. 



lOth Regent's Rep. p. 107. No diagn. First sp. L. concava, Hall, Pal. 

 N. York, iii, pi. 38, f. 1-7. (Group heterogeneous.) 



liCptocoelia, Hall. Terebratulidw? 18*59, 



12th Regent's Rep. pp. 32-3, f. 1,2,4. First figure, L. Jlabellites, Hall, 

 1. c. (Comp. Tropidoleptus, Centronella.) 



After excluding the L. concava {Coelospira, Hall), this 

 group appears to belong to the Terebratulidce. It is true 

 that the shell-structure appears to be fibrous, which, if nor- 

 mal, would remove it from this family as generally defined, 

 although the cases of Rliyncliopora and Syringothyris warn 

 the student that too much confidence is not to be placed in 

 the family value of this character, and that there is a possi- 

 bility of metamorphism rendering the punctation imper- 

 ceptible, so as to deceive the most eminent and careful ob- 

 servers. The character of the loop, if correctly interpreted 

 and figured, is certainly very similar to that of the Terebra- 

 tulidce, where it seems best to leave it until more is known. 



